checkNotNull(formula);
try {
return new AntlrUtils<raLexer, raParser>() {
@Override
public raLexer createLexer(CharStream input) {
return new raLexer(input) {
/* bail out at the first lexical error */
@Override public void recover(LexerNoViableAltException e) {
throw new RuntimeException(e);
}
};